The bottom bracket shell is cut to 35×100 mm — not BSC, not Italian — the thread that tells you this Peugeot PR10 was made at a time when French standards still ruled. That’s a boon for the restorer chasing period-correct parts, and it’s the first detail you check when a Reynolds 531 tubeset appears on the bench.
Why this PR10 stands apart
Reynolds 531 is the tubing that defined a generation, but the numbers here make the build path clear. Total mass tips the scales at 3130 grams with the fork. The fork steerer itself carries a 25×100 mm thread — another French hallmark. Rear dropout spacing sits at 122.3 mm, which aligns perfectly with 5-speed freewheels and threaded hubs. The frame is designed for 700C wheels (622 mm bead seat diameter), so modern rubber rolls on without hassle.
Technical specifications
- Material: Steel
- Bottom bracket thread: 35×100 “French”
- Fork steerer thread: 25×100
- Wheel size: 700C – 622 mm
- Country of origin: FRANCE
The paintwork shows significant wear — scuffs, chips, and areas of corrosion that the photos capture in full. That’s why the images are integral: they document exactly where the finish has failed and where the steel retains its integrity. No hidden surprises.
For a slightly larger sibling, the Peugeot PR10 58×57 cm frame shares the same French threading and Reynolds 531 pedigree. If you prefer a fully lugged PX10 version, the Peugeot PX10 PY10 56×57.5 cm frameset offers a slightly tighter rear end at 125.2 mm. Both keep the build strictly within the French ecosystem.
FAQ
What is the bottom bracket threading on this Peugeot PR10?
The bottom bracket shell uses the French standard 35×100 mm thread, not BSC or ITA. You’ll need a matching French-threaded bottom bracket.
What wheel size fits this frame?
It is built for 700C wheels (622 mm bead seat diameter), so modern tyres and rims will mount without issue.
What condition is the paintwork in?
The paint is damaged, with scuffs, chips, and areas of corrosion. The photos are part of the listing and show the exact state of the finish.
What rear spacing does the frame have?
The rear dropout spacing measures 122.3 mm, which is typical for 5-speed freewheel hubs of the era.
Is the frame suitable for a fixed-gear conversion?
The 122.3 mm spacing and French threading mean you’d need specific components. With the right hub and bottom bracket, a fixed-gear build is possible.
